J-isopbopoxy phenothiazine



Patented Mar. 4, 1952 UNITED STATES PATENT OFFICE 3-ISOPROPOXYPHENOTHIAZINE Nathan L. Smith, Indian Head, Md.

No Drawing. Application October 30, 1950, Serial No. 193,019

1 Claim. (Cl. 260-243) (Granted under the act of March 3, 1883, asamended April 30, 1928; 370 O. G. 757) 1 This invention relates to a newphenothiazine leum ether from which it crystallized in the formderivative. of yellow leaflets, M. P. 123-424 C.

The new compound of the invention is 3-iso- The invention describedherein may be manupropoxy phenothiazine of the structural formula:factured and used by or for the Government of H 5 the United States ofAmerica for governmental m purposes without the payment of any royaltiesthereon or therefor.

What is claimed is: OTCHWHQ As a new compound, 3-isopropoxy phenothial0zine. which is an antioxidant for substances such as gasoline andpetroleum lubricating oils and for NATHAN SMITH synthetic lubricantssuch as diesters and poly- REFERENCES CITED ethylene glycol.

The new compound may be prepared in known 1.5 The following referencesare of record in the way by reacting sulfur with the corresponding fileof thls patent: diphenylamine in the presence of iodine as cata- UNITEDSTATES PATENTS lyst. The preparation thereof is illustrated by thefollowing specific example in which parts are g 2 15 by Welght- Z 202,504,980 Houston et a1 Apr. 25, 1950 Exam? 8 2,505,772 Houston May 2,1950 1 part sublimed sulfur was mixed with 4 parts p-isopropoxydiphenylamine and 0.5 part iodine. OTHER REFERENCES The mixture washeated at 130-140 C. for one- Pummeler t l-t Chem. Abst., vol. 7, (1page,

half hour. The product was taken up in petro- 25 3337-3339)

